Changing psycopg to psycopg2 as the package upgrade PR has been reverted

pkg/linux/build-functions.sh

@@ -60,7 +60,7 @@ _create_python_virtualenv() {
     pip3 install wheel
 
     # Install the requirements
-    pip3 install --no-cache-dir --no-binary psycopg -r "${SOURCEDIR}/requirements.txt"
+    pip3 install --no-cache-dir --no-binary psycopg2 -r "${SOURCEDIR}/requirements.txt"
 
     # Fixup the paths in the venv activation scripts
     sed -i 's/VIRTUAL_ENV=.*/VIRTUAL_ENV="\/usr\/pgadmin4\/venv"/g' venv/bin/activate